OPTICAL MATERIALS
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2023
·
IF 3.9
Xiaoyan Zhao,Yongcheng Zhou,Hua Guo,Yuqi Zhai,Xianrui Zou,Donghui Wang
Titanium dioxide (TiO 2 ) has received widespread attention as high stability, low toxicity and costless photocatalyst , but it only exhibits photocatalytic activity under ultraviolet (UV) light. To improve TiO 2 photocatalytic efficiency, Bio-CaCO 3 /WO 3 /TiO 2 /(Ca,Y)F 2 :Tm,Yb was prepared. TiO 2 was combined with upconversion materials, coupled with WO 3 and loaded on oyster shell powder (Bio-CaCO 3 ), which showed that the prepared photocatalyst effectively reduce the band gap of TiO 2 , expand the photoreaction range of the material and avoid agglomeration, thus improving its photocatalytic efficiency and antibacterial efficiency. The photocatalytic degradation efficiency of Bio-CaCO 3 /WO 3 /TiO 2 /(Ca,Y)F 2 :Tm,Yb (50 mg) was 24.32% higher than that of TiO 2 /(Ca,Y)F 2 :Tm,Yb in 90 min. And its antibacterial rates against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) were enhanced by 38.68% and 25.89% compared to TiO 2 /(Ca,Y)F 2 :Tm,Yb, respectively.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Long Cheng,Yang Zhang,Weikang Fan,Yuanhui Ji
As far as we know, biochar-based photocatalysts were rarely used in wastewater treatment, and their application was limited due to the catalyst agglomeration and low electron mobility efficiency. A novel biochar/2Zn 3 In 2 S 6 /WO 3 (BC/2ZIS/WO 3 ) photocatalyst was synthesized by the hydrothermal method, which has synergistic performance of adsorption and photocatalysis. BC, the carrier of the ZIS/WO 3 heterojunction , with a large specific surface area (1161.25 m 2 /g), good electrical conductivity, improved the efficiency of catalyst charge separation, and significantly enhanced the photocatalytic performance. The adsorption isotherm experiment showed that the maximum adsorption capacity of the BC/2ZIS/WO 3 for MB and RhB was 120.04 and 466.55 mg/g, respectively. Under the synergistic effect of adsorption and photocatalysis, the removal rates of MB and RhB reached 80.5% and 99%, respectively, which were significantly higher than that of the single heterojunction. Furthermore, through DFT calculations, trapping experiments, and HPLC-MS, the adsorption, degradation mechanism and pathways were elaborated. In general, this work provided important insights into the role of biochar in improving the photocatalytic degradation of pollutants, and guided the design of environment-friendly photocatalysts in the future.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Qifeng Chen,Guoming Gao,Huailin Fan,Jie Zheng,Lulu Ma,Yanyu Ding,Yanfen Fang,Ran Duan,Xiaofeng Cao,Yanchuan Guo,Dongge Ma,Xun Hu
The surface property of a photocatalyst, including surface acid sites and oxygen vacancies, plays a pivotal role in photocatalytic organic synthesis reactions. Benzoin isopropyl ether (BIE) is usually produced via polycondensation of benzaldehyde and catalyzed with highly toxic cyanide. Here, we report a green photocatalytic approach for the selective synthesis of BIE over WO3 driven by a green-light-emitting diode. The improved photocatalytic activity can be attributed to the synergy of oxygen vacancies (VOs) and acid sites over N-doped WO3 nanobelts. The results revealed that reactant molecules were predominantly adsorbed and activated on surface oxygen vacancies (VOSs) and the Brønsted acid promoted the etherification reaction; the introduction of VOs and nitrogen altered the band structure and electronic properties, resulting in improved photocatalytic activity. Our work provides an efficient approach to the selective photocatalytic synthesis of organics over photocatalysts with finely tuned surface properties and band structures via defect and doping engineering.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Tianxiang Zhang,Tao Zhang,Hanping Fu,Li Feng,Qing Zhang,Shufen Ren,Jiayun Cheng,Qingshuang Liang,Xiufeng Xiao
Rational heterojunction interface construction and defect engineering have been regarded as significant strategies to enhance the photocatalytic performance of hydrogen peroxide (H 2 O 2 ) production. Herein, a novel 2D/1D BiOBr/WO 3 Z-scheme heterostructure with compact interface and rich oxygen vacancies (OVs) was successfully fabricated by an in situ -growth procedure. The rational design architecture and electronic structure allow the photocatalytic system to fully optimize light absorption, charge separation, and surface redox reaction . Benefited from synergistic effect of the formation of compact Z-scheme heterostructur and oxygen vacancies , the as-prepared BiOBr/WO 3 photocatalysts exhibit a greatly improved photocatalytic performance in the production of H 2 O 2 with a yield of 82.4 mM/h/g. We believe that this work provides a novel sight to develop high-efficiency photocatalyst via microstructure nanointerface control and defect engineering.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2020
·
IF 1.943
Rui Shi,Zhijuan Zhang,Fang Luo
Due to environmental pollution caused by organic pollutants, there is an urgent need to develop renewable and environmentally friendly energy sources. In this study, N-doped graphene-based CuO/WO 3 /Cu photocatalyst (CuO/WO 3 /Cu@CN) was prepared for degrading organic pollutants by using Cu(salen)PW 12 complex as the precursor and GO as the substrate. The CuO/WO 3 /Cu@CN photocatalyst not only solved the problem that CuO/WO 3 heterojunction easily expands into powder and causes poor recyclability, but also effectively promoted the separation of photoinduced e - and h + and inhibited their recombination. The catalyst can effectively catalyze the decomposition of 4-nitrophenol, and the cycle test confirmed that it has good cycle stability. Under UV–Vis light irradiation, CuO/WO 3 /Cu@CN can effectively degrade four kinds of organic dyes and the mechanism of photocatalytic degradation of organic dyes was deduced. It is worth noting that N-doped graphene regulates the band-gap of the material, leading CuO/WO 3 /Cu@CN to generate hydrogen in the photocatalytic process. This study is expected to provide a promising way for effective degradation of organic pollutants.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 6
·3298-3310
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IF 3.591
Zhi-Yu Liang,Ren-Kun Huang,Ruo-Wen Liang,Dan-Hua Xie,Gui-Yang Yan
Nowadays, visible-light-driven photocatalysts are considered to be prospective candidates for solving the crisis of energy shortage and environment pollution. Herein, with the support of WO3 nanorods (NRs), which possess a fast electron transmission and low carrier diffusion, a series of direct Z-scheme ZnIn2S4/WO3 photocatalysts are exquisitely fabricated by an in situ self-assembly route with ZnIn2S4 (ZIS) and WO3 NRs. Photocatalytic activities towards both selective hydrogenation of aromatic nitro compounds and non-selective oxidation of organic compounds demonstrate that these as-fabricated heterostructured nanocomposites exhibit remarkably enhanced photocatalytic activities owing to the highly efficient separation of photogenerated electrons and holes. Furthermore, the characteristics of electron spin resonance (ESR) spectra clearly suggest that the as-fabricated nanocomposites follow the direct Z-scheme-dominated photoredox catalytic mechanism. Additionally, combining the results of ESR and X-ray photoelectron spectroscopy (XPS), it can be concluded that the photo corrosion of ZnIn2S4 is significantly postponed after integration with WO3 NRs. Finally, we will be greatly pleased if this work could afford a theoretical exemplification and synthetic strategy for rationally designing and utilizing direct Z-scheme photocatalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Dong Lin,Minghuan Gao,Lisha You,Yue Li,Zhiying Li,Linna Guo,Tiesheng Li,Minghua Liu
A series of novel Ag/AgVO 3 /WO 3 homojunction/heterojunction nanomaterials (denoted as AVW-x , x = 10, 20, 30, 40) were designed and synthesized by a simple coprecipitation method. Compared with the other materials, AVW-10 exhibited a unique photochemical performance with a wider absorption range, higher surface area and improved separation of charge carriers. The photocatalytic activity of AVW-10 for degrading RhB was investigated, and the apparent rate constant was 3.11 and 57.2 times higher than those of pure AgVO 3 and WO 3 . Interestingly, the photostability of the recycled catalyst could be significantly enhanced by adding a small amount of benzoquinone (BQ) due to the interaction between BQ and the catalyst, indicating that this addition might be an efficient way to enhance the photoactivity by promoting the separation of photoinduced carriers. Furthermore, trapping experiments were designed and systematically explored, and •O 2 − was identified as the main active species causing photocatalytic degradation of RhB. A new kind of type Ӏ plus Z-scheme mechanism was also proposed.
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
·
IF 7.1
Xueming Dang,Zhilian Song,Huimin Zhao
A novel photoelectrochemical (PEC) sensing strategy with an amplified signal was proposed based on polypyrrole/g-C 3 N 4 /WO 3 inverse opal photonic crystals triple heterojunction. The sandwich-type detection model was applied to increase the sensitivity and favor the assembly of heterojunction structure. The heterojunction among PPy, g-C 3 N 4 and WO 3 highly improved the separation of photo-generated charges. Meanwhile, WO 3 IOPCs with good optical performance were employed to enhance the light absorption of PEC detection electrode. With the simultaneous combination of these amplification techniques, the designed PEC sensor achieved high sensitivity with low limit of detection (LOD) as 0.004 nM (≈ 1.99 ng L −1 ) and admirable selectivity in the detection of oxytetracycline under visible light irradiation.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2021
·
IF 2.495
Jianke Tang,Rongqian Meng,Yanfeng Xue,Shengjian Zhang,Qiaoling Li
A novel Ag 3 PO 4 /WO 3 ·H 2 O composite was prepared by loading Ag 3 PO 4 on WO 3 ·H 2 O substrate via a two-step hydrothermal method and characterized by various analytical techniques. The photocatalytic performance was evaluated by the degradation of methylene blue (MB) and oxytetracycline (OTC) under visible light irradiation. Within 30 min, 98.9 % MB can be degraded by the Ag 3 PO 4 /WO 3 ·H 2 O composite with a molar ratio of 3:1 (3Ag/1W), which is higher than that of individual Ag 3 PO 4 and WO 3 ·H 2 O. The 3Ag/1W photocatalyst also exhibits improved photocatalytic activity for OTC degradation than pure WO 3 ·H 2 O and Ag 3 PO 4 . The improvement of photocatalytic activity would be mainly ascribed to the highly efficient separation of photo-induced electron-hole pairs due to matched band structure, as confirmed by photoluminescence spectra (PL) and photocurrent responses test. According to the experimental results of radical trapping and electron spin resonance (ESR), a possible photocatalytic mechanism of the Ag 3 PO 4 /WO 3 ·H 2 O composite was proposed.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Jianping Sheng,Ling Zhang,Liu Deng,Yajing Han,Liqiang Wang,Haichuan He,You-Nian Liu
Tungsten oxide is a promising nanodrug in phototherapy via transforming light energy to reactive oxygen species and heat. Nevertheless, the phototherapeutic activity of the tungsten oxide nanomaterials is generally activated under 980 nm laser, which is close to the absorption of normal tissue, resulting in unfavorable heating effect on normal tissues. Therefore, the tungsten oxide nanomaterials which can be excited under 808 nm are highly required to avoid overheating and obtain deep tissue penetration of near-infrared (NIR) laser. Here, we successfully synthesized a novel dopamine enveloped tungsten oxide nanodots (WO 3−x /Dpa-Mel NPs) via facile one-step solvothermal route, using dopamine as the template and reductant in triethylene glycol solvent. Under the 808 nm laser irradiation, the as-obtained WO 3−x /Dpa-Mel NPs exhibit excellent photodynamic activity and stability. Meanwhile, the WO 3−x /Dpa-Mel NPs also possess high photothermal conversion property. Thus, the photothermal therapy (PTT) and photodynamic therapy (PDT) can be triggered simultaneously under single 808 nm laser irradiation. Additionally, the inherited good biocompatibility and dispersity in aqueous solution from dopamine hydrochloride (Dpa-Mel) also make the WO 3−x /Dpa-Mel NPs more suitable for in vivo application. The as-obtained WO 3−x /Dpa-Mel NPs exhibit an excellent synergistic phototherapy effect on solid tumor ablation in vivo without damaging healthy tissues under single 808 nm NIR light irradiation, indicating WO 3−x /Dpa-Mel NPs can serve as a multifunctional therapeutic nanoplatform to realize the synergistic cancer therapy.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 1
·286-301
·
IF 2.993
Fang Hongbiao,Cao Xin,Yu Jiajie,Lv Xiang,Yang Nan,Wang Tianhe,Jiang Wei
Tungsten oxide (WO 3 ) is a well-known photocatalyst, but its application is restricted due to its low conduction band and reduction power. In addition, WO 3 catalyst in powder forms has little application prospect because of difficulties in separation and regeneration. In this work, we prepared WO 3 /Ag/AgCl films on conventional glass that not only have much enhanced photocatalytic capability but also can be readily regenerated. The WO 3 film was prepared on glass substrate by calcination of spin-coated W precursor. Ag/AgCl particles were then deposited on WO 3 film by an impregnating–precipitation–photoreduction method. The photocatalytic efficiency of WO 3 /Ag/AgCl was evaluated by using methyl orange (MO) and Rhodamine B (RhB) as target pollutants. The highest photocatalytic performance was achieved with the 3-WO 3 /Ag/AgCl film, being 18 and 13 times higher than that of pure WO 3 film for degradation of MO and RhB, respectively. The degradation rate for both MO and RhB by 3-WO 3 /Ag/AgCl film catalyst decreased by less than 5% after five cycled tests. The photodegradation mechanism was discussed based on the electrochemical impedance spectroscopy Nyquist tests, photoelectrochemical analysis and reactive oxygen species scavenging experiments. A possible all-solid-state Z-scheme mechanism is proposed based on the photoelectron chemical tests and radical trapping experiments. This study provides a feasible technique to prepare a photocatalytic film with practicability and reproducibility.
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Journal of Physical Chemistry C
·
2016
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IF 4.509
Jing Ding,Yuanyuan Chai,Qianqian Liu,Xin Liu,Jia Ren,Wei-Lin Dai
WO3 nanorods with a regular hexagonal morphology and different exposed facets were fabricated by hydrothermal treatment, and then Ag nanoparticles (Ag NPs) selectively deposited onto hexagonal WO3 nanorods with different facets were also successfully synthesized through an in situ photoreduction method. The prepared samples were characterized by various analytical techniques, such as X-ray diffraction, X-ray photoelectron spectroscopy, UV–vis diffuse reflectance spectroscopy, photoluminescence spectra, and so on. The results illustrated that the intrinsic nature of charge separation on the {001} facets of WO3-110 nanorods and the surface plasmon resonance (SPR) effect both contribute to the enhancement of visible-light absorption and the decrease of the recombination of the photogenerated electron–hole pairs. For comparison, Ag/WO3-110 catalysts with dominant exposed {001} facets exhibited much better photocatalytic activity than that of Ag/WO3-001 with a high percentage of exposed {100} and {010} facets for the degradation of organic pollutants (including rhodamine B, methyl orange, and so on) under the visible-light irradiation. In addition, the underlying photocatalytic reaction mechanism was further investigated by the controlled experiments using radical scavengers.
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